Determination of Radio Spectra from Catalogues and Identification of Gigahertz Peaked Sources Using the Virtual Observatory

Details Determination of Radio Spectra from Catalogues and Identification of Gigahertz Peaked Sources Using the Virtual Observatory Determination of Radio Spectra from Catalogues and Identification of Gigahertz Peaked Sources Using the Virtual Observatory

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asvo.proc..113v&link_type=abstract

Astronomical Spectroscopy and Virtual Observatory, Proceedings of the EURO-VO Workshop, held at the European Space Astronomy Cen

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used the 20 largest radio continuum catalogues contained in VizieR (Ochsenbein et al. 2000) to determine radio continuum spectra between wavelengths of 2cm and 1m. For 67,000 out of the 3.5 million catalogueed sources we could extract radio spectra with measurements at at least 3 independent frequencies. These have been validated by comparison with existing spectral indices from the literature. Our radio spectra data base was searched for Gigahertz peaked source candidates, which we then observed quasi-simultaneously with the Effelsberg 100-m radio telescope at 6 cm (4.85 GHz), 2.8 cm (10.45 GHz), and 9 mm (32 GHz). This is an efficient procedure to discover new Gigahertz peaked sources, which are believed to be AGNs at the beginning of their radio evolution. We are generalizing the method by using VO capabilities to (i) identify pertinent radio catalogues in the VO registry using Unified Content Descriptors (UCDs), (ii) extract relevant data, and (iii) normalize these for the determination of radio spectra. Software allowing semi-automated information retrieval is being developed within the framework of the European VO-TECH project. The potential usage of all available radio catalogues using these methods will strongly increase the number of independent radio source cross-correlations and radio spectra. The results are progressively being made available to the community through the CDS services.

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